Longest Uptime Streak
A hard SQL mock interview question on DataDriven, with an AI interviewer who asks follow-up questions and a hire or no-hire decision at the end.
- Domain
- SQL
- Difficulty
- hard
- Seniority
- L5
Interview Prompt
We're monitoring health checks streaming in for a fleet of services, and we want to know which one held up best. Find the longest unbroken run of consecutive healthy checks that any single service recorded, and return that service with the length of its run.
Summary
Pass, pass, pass. How long until fail?
How This Interview Works
- Read the vague prompt (just like a real interview)
- Ask clarifying questions to the AI interviewer
- Write and run your SQL against a real database
- Answer the interviewer's follow-up questions, then get a hire or no-hire decision